JPS58147823A - Detector of track shift - Google Patents

Detector of track shift

Info

Publication number
JPS58147823A
JPS58147823A JP3079682A JP3079682A JPS58147823A JP S58147823 A JPS58147823 A JP S58147823A JP 3079682 A JP3079682 A JP 3079682A JP 3079682 A JP3079682 A JP 3079682A JP S58147823 A JPS58147823 A JP S58147823A
Authority
JP
Japan
Prior art keywords
light
subordinate
influence
spots
guide groove
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP3079682A
Inventor
Masahiro Daimon
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP3079682A priority Critical patent/JPS58147823A/en
Publication of JPS58147823A publication Critical patent/JPS58147823A/en
Granted legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/0901Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for track following only
    • G11B7/0903Multi-beam tracking systems

Abstract

PURPOSE: To detect a track shift securely without any influence of recording bits recorded by light spots, by projecting at least two subordinate light spots on an unrecorded part of a guide groove in a record carrier.
CONSTITUTION: According to modulation imposed on the light intensity of a light spot A, the light intensity of the reflected light beams of subordinate light spots B1, C1, B2, and C2 is modulated. The reflected light beams of the subordinate spots B2 and C2 over the recording part of the guide groove 15 have light intensity modulated by the influence of recording bits. For this purpose, the reflected light beams of the subordinate spots B1 and C1 projected on the unrecorded part of the guide groove 15 wherein the influence of the recording bits 16 is not exerted are used and guided to photodetectors 20 and 21 shown in the figure respectively. The outputs of the photodetectors 20 and 21 are supplied to a differential amplifier 14 for differential amplification to detect the extent and direction of a shift of the light spot A from the guide groove 15 without the influence of the recording bits 16.
COPYRIGHT: (C)1983,JPO&Japio
JP3079682A 1982-02-25 1982-02-25 Detector of track shift Granted JPS58147823A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3079682A JPS58147823A (en) 1982-02-25 1982-02-25 Detector of track shift

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP3079682A JPS58147823A (en) 1982-02-25 1982-02-25 Detector of track shift
US06/465,579 US4498159A (en) 1982-02-25 1983-02-10 Track deviation detecting apparatus
DE19833306144 DE3306144A1 (en) 1982-02-25 1983-02-22 Arrangement for detecting a track difference
NL8300705A NL8300705A (en) 1982-02-25 1983-02-25 Device for detecting a track deviation.

Publications (1)

Publication Number Publication Date
JPS58147823A true JPS58147823A (en) 1983-09-02

Family

ID=12313639

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3079682A Granted JPS58147823A (en) 1982-02-25 1982-02-25 Detector of track shift

Country Status (4)

Country Link
US (1) US4498159A (en)
JP (1) JPS58147823A (en)
DE (1) DE3306144A1 (en)
NL (1) NL8300705A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01302543A (en) * 1988-02-26 1989-12-06 Fujitsu Ltd Tracking error detecting method and diffraction grating and optical detector used for said detecting method
JPH0340231A (en) * 1989-07-06 1991-02-21 Sharp Corp Optical pickup device
JPH03102650A (en) * 1989-09-14 1991-04-30 Sharp Corp Optical pickup device
WO1993023848A1 (en) * 1992-05-13 1993-11-25 Matsushita Electric Industrial Co., Ltd. Optical disk unit
US5963515A (en) * 1996-11-15 1999-10-05 Teac Corporation Optical pickup device for detecting a tracking error of a main spot on an optical disk

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4695992A (en) * 1983-01-31 1987-09-22 Canon Kabushiki Kaisha Optical information recording-reproducing apparatus in which the relative position of a primary beam and secondary beams on recording medium is varied during recording and reproduction of information
US4720825A (en) * 1984-02-06 1988-01-19 Asahi Kogaku Kogyo Kabushiki Kaisha Optical data reproducing devices having improved trick play capability
US4679184A (en) * 1984-06-08 1987-07-07 Matsushita Electric Industrial Co., Ltd. Optical recording and reproducing apparatus having erasing beam spot with asymmetrical intensity distribution
EP0228620B1 (en) * 1985-12-10 1991-06-05 Nec Corporation Optical head comprising a diffraction grating for directing two or more diffracted beams to optical detectors
HU196518B (en) * 1986-12-22 1988-11-28 Itex Kutato Fejlesztoe Termelo Method and apparatus for the transformation and formation of laser beam
JPH0675307B2 (en) * 1987-01-30 1994-09-21 富士写真フイルム株式会社 Pickup for magneto-optical recording medium
JPH0638291B2 (en) * 1987-06-22 1994-05-18 三菱電機株式会社 Optical information recording / reproducing device
DE3889509T2 (en) * 1987-08-24 1994-10-20 Sharp Kk Optical scanning device and optical grating arrangement therefor.
JPH01171129A (en) * 1987-12-25 1989-07-06 Copal Co Ltd Optical head and tracking method
NL8802988A (en) * 1988-12-05 1990-07-02 Philips Nv Device for scanning an information sheet with optical radiation.
JPH077511B2 (en) * 1989-02-21 1995-01-30 パイオニア株式会社 Device for detecting reading position deviation in disc player
JP3402997B2 (en) * 1997-03-12 2003-05-06 株式会社リコー Optical pickup device
JP4321469B2 (en) * 2005-03-24 2009-08-26 ソニー株式会社 Disc recording apparatus and method, and recording control program

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL160138C (en) * 1972-05-11 1979-09-17 Philips Nv An apparatus for reading out a flat record carrier.
CA1013854A (en) * 1973-02-20 1977-07-12 John S. Winslow Videodisc mastering system
JPS524218B2 (en) * 1973-05-03 1977-02-02
FR2235448B1 (en) * 1973-06-29 1976-05-07 Thomson Brandt
JPS5398802A (en) * 1977-02-09 1978-08-29 Mitsubishi Electric Corp Optical reproducer
JPS626580Y2 (en) * 1979-11-17 1987-02-16

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01302543A (en) * 1988-02-26 1989-12-06 Fujitsu Ltd Tracking error detecting method and diffraction grating and optical detector used for said detecting method
JPH0340231A (en) * 1989-07-06 1991-02-21 Sharp Corp Optical pickup device
JPH03102650A (en) * 1989-09-14 1991-04-30 Sharp Corp Optical pickup device
WO1993023848A1 (en) * 1992-05-13 1993-11-25 Matsushita Electric Industrial Co., Ltd. Optical disk unit
US5475662A (en) * 1992-05-13 1995-12-12 Matsushita Electric Industrial Co., Ltd. Optical disc apparatus with tracking error compensation
US5963515A (en) * 1996-11-15 1999-10-05 Teac Corporation Optical pickup device for detecting a tracking error of a main spot on an optical disk

Also Published As

Publication number Publication date
NL8300705A (en) 1983-09-16
US4498159A (en) 1985-02-05
DE3306144A1 (en) 1983-09-01

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